Review on Enhanced Burr Polishing Accessories for Engraving and Grinding by Vince Preston

I go through them pretty quickly when preparing fossils. It doesn't matter how much you pay for premium brands; They will last as long as this one. I only cut with cooling water. Diamond bits don't last even minutes when dry cut at friction temperatures. Excellent quality. Good assortment. Special note: I'm happy that Revain is selling them at China prices. I buy them directly from China, wait 6 weeks for them, step and repeat. At this price and with almost overnight delivery, that would be a paradigm shift for me.